package com.practice.gateway.predicate;

import jakarta.validation.constraints.NotEmpty;
import org.springframework.cloud.gateway.handler.predicate.AbstractRoutePredicateFactory;
import org.springframework.cloud.gateway.handler.predicate.GatewayPredicate;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.server.ServerWebExchange;


import java.util.List;
import java.util.function.Predicate;

@Component
public class VipRoutePredicateFactory extends AbstractRoutePredicateFactory<VipRoutePredicateFactory.Config> {


    public VipRoutePredicateFactory() {
        super(Config.class);
    }

    @Override
    public Predicate<ServerWebExchange> apply(Config config) {

       return new GatewayPredicate() {
           @Override
           public boolean test(ServerWebExchange serverWebExchange) {

               ServerHttpRequest request = serverWebExchange.getRequest();

               String first = request.getQueryParams().getFirst(config.param);

               return StringUtils.hasText( first) && first.equals(config.value);
           }
       };
    }

    public List<String> shortcutFieldOrder() {
        return List.of("param", "value");
    }

    @Validated
    public static class Config {



        @NotEmpty
        private String param;

        @NotEmpty
        private String value;

        public @NotEmpty String getParam() {
            return param;
        }

        public  void setParam(@NotEmpty String param) {
            this.param = param;
        }

        public @NotEmpty String getValue() {
            return value;
        }

        public  void setValue(@NotEmpty String value) {
            this.value = value;
        }

    }
}
